Riser sleeve



FIG. 1 is an isometric view of the riser sleeve;

FIG. 2 is an end view of the riser sleeve;

FIG. 3 is a side top view of the riser sleeve;

FIG. 4 is a rear view of the riser sleeve;

FIG. 5 is a front view of the riser sleeve;

FIG. 6 is a longitudinal cross section taken on the line 6--6 of FIG. 4;

FIG. 7 is a transverse cross-section taken on the line 7--7 of FIG. 3; and,

FIG. 8 is a transverse cross-section taken on the line 8--8 of FIG. 3. 

An ornamental design for a riser sleeve, as shown and described. 